The T-s diagram of an ideal Rankine power cycle with two reheat cycles and two open feedwater heaters is shown in Fig. 8.39. Steam leaves the boiler at state 7 at 3000 psia and 1200°F. Steam at 400 psia leaves the high-pressure turbine at state 8; some of the steam preheats water in feedwater heater #1 from state 4 to state 5, while the remainder is reheated to 1000°F at state 9. Steam at 80 psia is extracted from the low-pressure turbine at state 10; some of that steam preheats water in feedwater heater #2 from state 2 to state 3, while the remainder is reheated to 800°F at state 11. Steam at 4 psia leaves the low-pressure turbine at state 12. For a mass flux m · = 50 lbm/s through the boiler, calculate:
i) The steam flow rate diverted to each feedwater heater
ii) The power output of the turbine
iii) The total heat addition by the steam generator
iv) The temperature of the steam exiting the turbine
v) The heat loss from the condenser
vi) The total pump horsepower
vii) The thermodynamic efficiency of the cycle